High Quality Content by WIKIPEDIA articles! Clarkstown High School North is a high school located in Rockland County, New York educating students in grades 9 through 12. Clarkstown North or simply "North," as it is referred to by students and staff, is one of two high schools in the Clarkstown Central School District (CCSD). Since 2006, North offers the International Baccalaureate Diploma Programme to juniors and seniors.